Funny belt wear

All right, I need help from the experts. My brothers drive belt keeps exploding in less than 10 hours of riding. The belt is wearing on one side and not the other until it just finally goes to shreds. He has tried expensive belts and cheap belts and no change. We have taken the clutch apart to make sure everything is smooth. Could this be an alignment problem? Please help as we are out of ideas and gettin realy tired of changing belts.

Yes I would check the alignment. Polaris has a special tool...
But on both of mine the belt barely touches the rear sheave of the primary when the engine is off. If it is in the center of the bearing, touching the front sheave, or rubbing up against the rear sheave excessively, I would say it is out of alignment.
There are shim washers under the secondary to align the clutch. add or subtract washers to line it up.

While you are in there, check the bearing in the primary to make sure it is turning smoothly. they can get plugged with belt dust and/or burn up.

Another thing to check is the washers on each side of the bearing. Sometimes when you blow a belt the high heat will destroy the washers.

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not sure if this will help you but my first one would shread a belt every hunderd miles or so couldnt figure out what it was so i took one of the shims out from behind the secondary and problem solved for me it has two

It sounds like an alignment issue as Cliff has covered well but I would add that these belts do need to be broken in if new, the owners manual does cover this,
John

If it's wearing on one side, and shredding on you quickly, I'd say its an alignment issue.

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2009 RZR S MCX Big Bore and Turbo
2010 RZR 4 (stock because I promised the wife not mod it...... I'm teaching my son how to turn wrenches )
2006 Raptor 700
2000 Honda Foreman (old trusty)